However, there are some situations where all the audience may not have the necessary tools to communicate at the same platforms like a user not having Skype installed or not having a Twitter account.
This is where the disposable chat systems become handy. Whether you will be talking with a client, a teammate or a friend, just a standards compliant browser & an internet connection will be enough.
Here are 7 easy to use & free disposable chat systems (text or video) for an instant communication:

TinyChat

TinyChat is probably the most popular disposable chat application.
It has support for both video & text where both works very nice.
There is also an API to automatically create rooms which is great for integrating it with 3rd party products.

BabelWith.Me

The application offers a quick group chat with a unique feature: it can translate the content from 45 different languages instantly which makes the communication of x number of users not speaking each other's language possible.

BoostCam

BoostCam creates a two-way video conferencing room with just a click without the need of installing any plugins.

Ubiqq

An instant video chat system for 2 users. Just enable the application to reach your camera + microphone and no more settings.

Stinto

A simple disposable chat system which work perfectly with no problems. Just click the "create chat" button & that's all.
It does not offer password-protected pages.

Disposible Chat

Again a simple application where any number of users can connect. Optionally, you can password-protect your page to make sure the chat is private.

ChatMaker.NET

Besides standard chat rooms, you can signup & create private rooms which are password protected and the communication is encyrpted.